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 12

\( \sum n^{2} \)

n=5

 Feb 12, 2019
 #3
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\(\quad \displaystyle\sum^{12}_{n=5}n^2\\ =5^2 + 6^2 + 7^2 +\cdots + 12^2\\ = 620\)

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 Feb 14, 2019

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